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https://issues.apache.org/jira/browse/LUCENE-2378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879546#action_12879546
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Yonik Seeley commented on LUCENE-2378:
--------------------------------------

OK, here's an updated TestEnumPerf.java that tests iteration over docs.  It's 
obviously the culprit.
Args: 1000000 999 100000 10  (same as before, just fewer iterations).

trunk=11146ms, branch_3x=4271ms.  trunk is 160% slower!

> Cutover remaining usage of pre-flex APIs
> ----------------------------------------
>
>                 Key: LUCENE-2378
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2378
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 4.0
>
>         Attachments: LUCENE-2378.patch, LUCENE-2378.patch, 
> LUCENE-2378_FileFloatSource.patch, LUCENE-2378_UnInvertedField.patch, 
> TestEnumPerf.java
>
>
> A number of places still use the pre-flex APIs.
> This is actually healthy, since it gives us ongoing testing of the back 
> compat emulation layer.
> But we should at some point cut them all over to flex.  Latest we can do this 
> is 4.0, but I'm not sure we should do them all for 3.1... still marking this 
> as 3.1 to "remind us" :)

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